Improvement in stove-pipe dampers



- 3 Svh eets-S*hee 1. E. R. HALL & D. A. KEYES Improvement inSt'oye-Pip'e Dampers. N0. 114,806. Patnted Ma 1,y`l6187.

3 Sheets-Sheet 2I E. R. HALL & D. A. KEYES. Improvement n Stove-P,ipeDampers.

Patented May1,1871.

3 Sheets-Shee 3. -E. R. HALL 8L D. A'. KEYES.

Improvement in Stove-Pipe Dampers. l No. 114,806, Patented May 16,1871.

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-ELI R. HALL AND DANIEL A. KEYES, CE NORFOLK, CONNECTICUT.

Letters Patent No. 114,806, dated May 16, 1871.

IMPROVEMENT IN STOVE-PIPE DMPERS.

The Schedule referred to ln these Letters P'atent and making y xt of thesame.

`l'o all whom fit 'may concern s 'Be it known that we, ELI R. HALL andDANIEL A. KEYES, both of Norfolk, county of Litchfield and State ofConnecticut, have invented au Improvement in Stove-Dampers; and we dohereby declare that the following is a full and exact descriptionthereof, reference being had to the accompanying drawing making part ofthis specification-` Figure 1 being a side velevation of a damper atrest, opening the full draught of the stove.

Figure 2 is also aside elevation ofthe same, show-l .ing the wings orsegments forming the damper in a horizontal position, closing thedraught.

Figure 3 is a top view of fig. 2.

Figure 4 represents a planv of the two segments or securing, at rightangles, two cylindrical bands, A A',

which sel-veto retain the damper in position, and upon which to mountthe shaft B, to which the various moving parts are secured.

At the lower side of the perpendicular band A is formed a step, D, whichretains the lower end of the shaft.B in position upon the band A, whilethe upper End, E, passes through the band at c, as shown in To thisperpendicular shaft B, at or near the center,

itis secured, in any convenient manner, a cross-bar, F,

'Ijo this cross-bar, at s s s s, are pivoted the segments or wingsforming the damper proper, which,

when closed, as in figs. 2 and 4, completely cut off the draught.

These wings or segments of a circle, when at rest,

'The pressure of the draught through the pipe and against the lowersurfaces of the segments, standing at an angle, causes them to rotateand to move perpendicularly through the are of a circle, of which the'cross-bar, to which they are secured, is the center, lthereby lesseningthe draught as they continue to approach a horizontal position, as infigs. 2, 3, and 4.

In order to return .these wings or segments of a circle to theiroriginal position when at rest, as in tig. 1, and to adjust and retainthem to the pressure of the draught through the pipe to open. and closeit, as

the case may be, governing-weights I rest upon each segment, and arepivoted, by armsJ, to the upper end of the shaft B at u thus, when arotating motion is given to the segments'R by the pressure ofthe draughtthrough the pipe, the centrifugal force imparted to thegoverning-weights I causes them to rise, allowing the segments R todecrease the draught by lessening the passage, and as the draughtdecreases the velocity of the segments and their governing-weights,being pivoted to the same shaft, also decrease, and the falling oftheweights opens the segments or wings, adjusting themselves and maintainiuga steady and equal draught at all times, regardless of the amount oftire.

To prevent these segments passing a horizontal posit-ion in 'a strongdraught, they are each a triie more than a semicircle, overlapping eachother, as shown in figs. 2, 3, and 4, so that in an extreme draught theywill close entirely the passage in the pipe, and so remain until theiire shall subside to the required dcgree.

It willbe observed that when the draught is the strongest thegoverning-weights are nearer the outer edges ofthe segments or wings,imparting greater weight to govern the increased draught, and withalower tire, and consequently less draught, the segments open by thefalling of the governing-weights, which, as they approach the center of,the segments, impart less weight and render the segments moresensitive.

What we claim as our invention, and desire to secure by Letters Patent,is-

A stove-or furnace-damper, constructed in segments and governed byadjustable weights, the whole being self-acting, and arrangedsubstautiallyas herein set forth.

'ELI R. HALL.

DANIEL A. KEYES.

Vitnesses:

HInAM I. LAWRENCE, WATSON E. BnNoT.

